I created this, this afternoon. I'm guessing the proportions.
1 sweet potato 2 tsp ground cumin 1/2 tsp ground coriander seed 1 tablespoon butter little salt and freshly ground pepper 1/3 cup of "fresh" coconut milk (from a can) 1/2 tsp lemon zest
Cook potato 4 mins in microwave. Peel, slice and put in sauce pan. Over low heat, add butter and about 1/4 to 1/2 cup water. Mush around. When pasty, add spices and coconut milk. Cook ten minutes on low. Remove and blend. Wow! Eat.